/Engine/Plugins/FX/Niagara/Source/NiagaraEditor/Public/ViewModels/HierarchyEditor/NiagaraHierarchyViewModelBase.h
Returns a set result if the item can accept a drop either above/onto/below the item.
[TOptional](API\Runtime\Core\IO\TOptional)< EItemDropZone > OnCanRowAcceptDrop ( const [FDragDropEvent](API\Runtime\SlateCore\Input\FDragDropEvent) & DragDropEvent, EItemDropZone ItemDropZone, [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FNiagaraHierarchyItemViewModelBase](API\Plugins\NiagaraEditor\ViewModels\HierarchyEditor\FNiagaraHierarch-_6) > Item )